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Finding the Fourth Proportional to 18,718.76, 28,082.13 and 5,391.63

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Solution

The fourth proportional to 18,718.76, 28,082.13 and 5,391.63 is: 8,088.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,718.76 : 28,082.13 = 5,391.63 : x
  2. Step 2: Convert to fraction form
    18,718.76/28,082.13 = 5,391.63/x
  3. Step 3: Cross multiply
    18,718.76x = 28,082.13 × 5,391.63
  4. Step 4: Simplify right side
    18,718.76x = 151,408,434.35
  5. Step 5: Solve for x
    x = 151,408,434.35/18,718.76
  6. Step 6: Final answer
    x = 8,088.59

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.